android programming basics

[Book Note: Android game programming starts from scratch] 9. Game Development BASICS (how to quickly enter Android game development), learn android from scratch 1. Do not blindly view API documentationMany people prefer to explore API documentation when learning a new platfo

[Book Note: Android game programming starts from scratch] 12. Game Development BASICS (Canvas), Learning android from scratch 1. Canvas Canvas of the Canvas class encapsulates graphics and image painting. Common functions of this class are described as follows: DrawColor (int color) Purpose: Draw a color-covered canva

[Android Basics] multimedia programming section, android multimedia I. Use MediaPlayer 1) how to obtain a MediaPlayer instance:You can use the new method directly:MediaPlayer mp = new MediaPlayer ();You can also use the create method, such:MediaPlayer mp = MediaPlayer. create (this, R. raw. test); // you do not need to

]; ; //cumulative } } System.out.println (sum); Copy Code 05.20_java Language Basics (Study questions in Java and parametric transfer problems and illustrations) (master) A: Case Demo Read the program to write the results, and draw the memory diagram to explain public static void Main (string[] args) { int a = 10; int B = 20; System.out.println ("A:" +a+ ", B:" +b)

Original URL: http://www.jianshu.com/p/aba734d5b5cdRecently saw a lot of open-source projects about HotPatching--depoxed (Ali), Anfix (Ali), dynamicapk (Ctrip), they all use JNI programming, and JNI programming also runs through the Android system, Learning JNI programming is useful for us to learn about

Animation effect programming basics-animationandroidAnimation typeAndroid animation consists of four typesIn XMLAlphaGradient transparency animation effectScaleGradient scaling animation effectTranslateAnimation EffectRotateAnimation effects of screen transfer and RotationJava codeAlphaanimationGradient transparency animation effectScaleanimationGradient scaling animation effectTranslateanimationAnimation E

programming.9.2 Android Multithreaded ProgrammingFamiliar with the Java you, multithreaded programming must not be unfamiliar with it. When we need to perform some time-consuming operations, such as initiating a network request, taking into account the speed and other reasons, the server may not immediately respond to our request, ifDo not put such operations in

Getting started with Android 4 ProgrammingBasic InformationOriginal Title: Beginning Android 4 pplication DevelopmentAuthor: (beauty) Li weimeng [Translator's introduction]Press: Tsinghua University PressISBN: 9787302301516Mounting time:Published on: February 1, November 2012Start: 16Page number: 1Version: 1-1Category: Computer> Software and programming> mobile d

What is JNI and how to use itJni--java Native Interface, which is a feature of the Java platform (not specific to the Android system). In fact, the main definition of a number of JNI functions, so that developers can call these functions to implement Java code C + + code, the code can also call Java code, C + +, so you can play the characteristics of each language. So how to use JNI, in general, we will be the first to compile the C + + code to the co

Socket Programming Basics: Primary server-side programming and client programming. Server-side programming steps: 1: Create server-side sockets and bind to a port (0-1023 is System reserved, preferably about 1024) 2: Socket set listening mode waiting for connection reque

("DrawText", 10,15, paint); //--Draw pixel pointsCanvas.drawpoint (10,20, paint); //--Draw multiple pixel pointsCanvas.drawpoints (New float[]{10,30,30,30},paint); //--Draw a lineCanvas.drawline (10,40,50,40, paint); //--draw more than one lineCanvas.drawlines (New float[]{10,50,50,50,70,50,110,50},paint); //--Draw RectangleCanvas.drawrect (10,60,40,100, paint); //--Draw Rectangle 2Rect rect =NewRect (10,110,60,130); Canvas.drawrect (Rect,paint); //--Draw rounded rectanglesRECTF

is visible Set callback for Surfaceholder, similar to listening, to know the status of Surfaceviewsh.addCallback(new Callback() { // SurfaceView销毁时调用 @Override public void surfaceDestroyed(SurfaceHolder holder) { } // SurfaceView创建时调用 @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { }}); Once the Surfaceview is not visible, it will be dest

execution in current child thread//postinvalidate (); You can loop through a child thread to invoke executionInvalidate ();//Redraw the canvas return Super. OnKeyUp (KeyCode, event); } /*** Override touch-screen event functions*/@Override Public Booleanontouchevent (Motionevent event) {//gets the x-coordinate assignment of the user's finger touch screen and the text intx = (int) Event.getx (); //Gets the y coordinate of the user's finger touch screen and the text inty =

action frames, allowing its action frames to repeatedly playcurrentframe++; if(Currentframe >= 12) {Currentframe= 0; }} @Override Public voidrun () { while(flag) {LongStart =System.currenttimemillis (); Mydraw (); Logic (); LongEnd =System.currenttimemillis (); Try { if(End-start ) {Thread.Sleep (-(End-start)); } } Catch(interruptedexception e) {e.printstacktrace (); } } } /*** Key Event monitoring*/@Override Public BooleanOnKeyDown (

of loops, rate represents//Rate minimum 0.5 up to 2, 1 for normal speedSp.play (Soundid, 1, 1, 0, 0, 1);instead of stopping, you can use the pause (int streamid) method, where both Streamid and Soundid indicate the total number in the first argument of the constructed Soundpool class, and the ID starts at 0. Three, Android three kinds of ways to play video1. Use the player that comes with it. Specifies that the action is action_view,data to Uri,type

(Exception ex) {}finally { if(canvas!=NULL) {sfh.unlockcanvasandpost (canvas); } } }The Paint brush class provides an anti-aliasing function, in fact the canvas canvas also provides the amount of plot antialiasing functions, as follows:Canvas.setdrawfilter (Drawfilter filter);Function: Set drawing antialiasing for the canvasParameters: Drawing Filter InstanceInstantiate an object of the Drawfilter class, as shown in the following code:New Paintflagsdrawfilter (0,paint.anti_a

This example describes the Android Simple button event response synthesis hint control toast application. Share to everyone for your reference, specific as follows: We've talked about defining a button object in Main.xml, and here we'll learn how button implements the event response. Event handling that is triggered by button buttons, we call the event Handle, except that in Android, button events are con

. Sample CodeImport java.util.ArrayList;public class Javaarraylist {public static void Main (String[]args) {Initialization of a Java dynamic arrayArrayList al=new ArrayList ();Adding data to a Java dynamic arrayAl.add ("a");Al.add ("B");Al.add ("C");Output Java dynamic arrayfor (int i=0;iString Aleach= (String) al.get (i);System.out.println (Aleach);}Delete an element in an array, delete the second elementAl.remove (1);Modify the Java dynamic array and put the new element in the second positionA

This article describes the menu features in Android programming. Share to everyone for your reference, specific as follows: Android Menu design, the program defines two menu subkeys, one is "about", one is "exit", when clicked on "about", a new toast prompt, when clicked "Exit", we will end the program. In addition to the default coverage of OnCreate, you need

Button button1; Get the mobile screen resolution class private displaymetrics DM; public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.main); Get the layout of Textview,button to like Textview1 = (TextView) Findviewbyid (R.ID.TEXTVIEW1); Button1 = (Button) Findviewbyid (R.id.button1); Add Button Event Response Button1.setonclicklistener (new Button.onclicklistener () {public void OnClick (View v) { DM =